1. A method of inhibiting and/or controlling Septoria tritici blotch (STB) caused by Mycosphaerella graminicola, said method comprising treating a wheat plant infected by M. graminicola with Clonostachys rosea in an amount effective to inhibit and/or control the STB, or with a biological control agent (BCA) composition comprising C. rosea in an amount effective to inhibit and/or control the STB and at least one auxiliary compound, wherein the method is conducted in the absence of a chemical fungicide.
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